User Account

All Pages

Procedures use in a two-sample problem

Assignment Help Basic Statistics
Reference no: EM13929124

1) Does taking Vitamin D increase the mean lifespan of a rat? A sample of 20 rats was randomized to group 1 (control) and group 2 (Vitamin D). The lifespan (days) of each rat was measured. Here is some of the output: Which of the following is correct?

(a) About 95% of the time the lifespan increases by 80 days.
(b) If we were to repeat the experiment many times, then the confidence interval will contain the population value about 95% of the time.
(c) There is about a 3% chance that the lifetimes are longer for group 2.
(d) The standard deviation of the increase in lifetime is about 40 days.

2) Does taking Vitamin D increase the mean lifespan of a rat? A sample of 20 rats was randomized to group 1 (control) and group 2 (Vitamin D). The lifespan (days) of each rat was measured. Here is some of the output: Which of the following is correct?

(a) (b) (c) (d)

3) Does taking Vitamin D increase the mean lifespan of a rat? A sample of 20 rats was randomized to group 1 (control) and group 2 (Vitamin D). The lifespan (days) of each rat was measured. Here is some of the output: Which of the following is correct?

(a) Because 10 rats were randomized to each of the two groups, a matched pairs design could be used.
(b) About 95% of rats in group 1 have lifetimes between 470 days and 590 days.
(c) Because the two standard deviations are about equal, there is no evidence that the average lifetimes are different.
(d) The standard errors measure how much the average lifetime for each group could

4) Which of the following would lead us to believe that the t procedures were not safe to use in a two-sample problem with 100 subjects in each group?

(a) The same medians and means for the two groups were slightly different.
(b) The distribution of the data values were moderately skewed.
(c) The data was only integers so cannot be Normally distributed.
(d) Several outliers were detected in each group.

5) Which of the following is correct?

(a) Two-sample procedures should be used with matched pairs designs.
(b) If some of the matched pairs are missing some data, use a two-sample procedure as it does not require equal sample size in each group.
(c) The sample sizes in each group need to be equal to use two-sample procedures.
(d) Two-sample procedures can be used with random samples from each group and for experiments where a single population is randomized to the two groups.

6) IQ tests were administered to 31 seventh-grade girls and 47 seventh-grade
boys in a Midwest school district. The following is the output from an analysis of the data: Which of the following is correct?

(a) The two histograms are not identical. Therefore there is good evidence that the mean IQ scores differ between males and females.
(b) We are 95% confident that each boy has an IQ score that is 5 points greater than their matched girl. (c) Because the 95% confidence interval contains the value 0, there is no evidence of a difference in mean IQ score.
(d) The standard error measures the variation in IQ scores in each group.

7) IQ tests were administered to 31 seventh-grade girls and 47 seventh-grade boys in a Midwest school district. The following is the output from an analysis of the data: Which of the following is correct for testing the hypothesis of equality of mean IQ scores versus a difference in either direction?

(a) (b) (c) (d)

8) IQ tests were administered to 31 seventh-grade girls and 47 seventh-grade boys in a Midwest school district. The following is the output from an analysis of the data: Which of the following is correct?

(a) There is a 0.11 chance that the mean IQ scores differ between males and females.
(b) The probability that there is no difference in mean IQ scores is 0.11.
(c) Because the p-value is 0.11, there is no evidence ( ) of a difference in mean IQ scores between males and females.
(d) Because the p-value is 0.11, there is evidence ( ) of a difference in mean IQ scores between males and females.

9) Different varieties of the tropical flower Heliconia are fertilized by different species of hummingbirds. Over time, the lengths of the flowers and the forms of the hummingbirds' beaks have evolved to match each other. The following is an analysis of the length (mm) of the two color varieties: Which of the following is correct to examine if the mean length differs between the two varieties?

(a) (b) (c) (d)

10) Different varieties of the tropical flower Heliconia are fertilized by different species of hummingbirds. Over time, the lengths of the flowers and the forms of the hummingbirds' beaks have evolved to match each other. The following is an analysis of the length (mm) of the two color varieties: Which of the following is correct?

(a) The estimated difference in mean length between the two varieties is 3.53 (SE 0.45) mm. Because the confidence interval does not contain 0, there is evidence of a difference in mean length.
(b) About 95% of flowers have a difference in lengths between 2.6 and 4.4 mm.
(c) The dot-plot shows several outliers. Consequently, the t procedure is invalid.
(d) The degrees of freedom are fractions but the t table shows that they are integers. An error must have been made in computing the degrees of freedom.

Reference no: EM13929124

Questions Cloud

Confidence interval for the mean weight : The average weight of the sample is 10.2 g, and the standard deviation of weight among mice is 2 g. Find a 95% confidence interval for the mean weight of all the mice in the shipment.
List some differences between u.s. gaap and ifrs : List some differences between U.S. GAAP and IFRS for long-term operational assets.
Form of alternative dispute resolution : 1) The form of alternative dispute resolution wherein the parties hire someone to review the evidence and make a decision that is binding upon the parties is called
Following companies is likely to own : Give some examples of long term operational assets that each of the following companies is likely to own:
Procedures use in a two-sample problem : Which of the following would lead us to believe that the t procedures were not safe to use in a two-sample problem with 100 subjects in each group?
Describe the presence of the public or private sector : Describe one of the national planning approaches covered in the annual report. Explain how prevention, protection, mitigation, response, and recovery were integrated into the approach. Describe the presence of the public or private sector in the an..
Operations and supply chain management : Suppose that AlwaysRain Irrigation's marketing department will undertake an intense ad campaign for the bronze sprinklers, which are more expensive but also more durable than the plastic ones. Forecast demand for the next four years is
Examine the communication process : Examine the communication process, the primary conflict levels, and the process for negotiating resolutions within organizations.
Confidence interval for the proportion of the population : The insect then chooses one of the two branches. Suppose that 45 of 75 insects choose the pheromone branch. The 95% large-sample confidence interval for the proportion of the population that prefers the pheromone branch is:

Reviews

Write a Review

Basic Statistics Questions & Answers

  T- test of multiple regression model

Using 19 observations on each variable, a computer program generated the following multiple regression model:

  Sales using this multiple regression analysis

You will actually have negative sales using this multiple regression analysis

  Constructing confidence interval

A company sampled 40 of the springs that it manufactures for use in small engines and discovered that 20% of the springs did not meet specifications.

  A fair coin is tossed 500 times find the probability of

a fair coin is tossed 500 times. find the probability of obtaining more than 300

  The standard deviation of each sample was approximately

You wish to determine whether consumers have made substantial progress in reducing their credit card debt? Based on a sample of 1000 consumers in September 2001,

  Random process with mean

1. In all the following questions {Zt} is a purely random process with mean E[Zt ] = 0, variance Var(Zt) = σ 2 , and successive values of Zt are independent so that Cov(Zt , Zt+k) = 0, k 6= 0.

  Chebyshev theorem-other statistic rules

Use Chebyshev's theorem to find what percent of the values will fall between 162 and 292 for a data set with a mean of 227 and standard deviation of 13.

  A create a scatterplot for these data b calculate the

q1 is the gender of a nurse related to the specialty he or she chooses?? a hospital administrator counted the number of

  Computing value of exponentially smoothed series

Using smoothing constant of w = .80, compute the value of exponentially smoothed series in 1983.

  Cost benefit analysis proposal for new employe

Help with this Cost Benefit Analysis Proposal for New Employee. Please provide work in detailed step by step instructions thank you very much.

  Confidence interval of playbill magazine

Playbill magazine reported that the mean annual household income of it's readers is $219,155. Assume this estimate of the mean annual household is based on a sample of 91 house-holds and based on past studies,

  A pair of dice is rolled 10 times what is the probability

a pair of dice is rolled 10 times. what is the probability that a sum of seven is observed at most three

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd